如果功能中断页面

Question

我添加了一条if语句，如果查询没有返回空，它将显示数据$playersList = DB::table('pickup_results') ->select(DB::raw("playerID"), DB::raw("COUNT(CASE WHEN gameResult = 'Win' THEN 1 END) AS wins"), DB::raw("COUNT(CASE WHEN gameResult = 'Loss' THEN 1 END) AS loss"), DB::raw("COUNT(CASE WHEN gameResult = 'Tie' THEN 1 END) AS tie") ) ->where(DB::raw("from_unixtime(checkSumID) > date_sub(now(), interval 30 day)")) ->groupBy('playerID') ->orderBy('wins','DESC') ->get();

但是，如果查询为空，则应该为

if (!empty($query)

代码：

elseif (empty($query){
    echo 'There are no cars impounded'
}

没有if语句，它可以正常工作，但是在表中没有任何结果，它将给出错误并中断页面的其他功能

<?php
  try {
  $con= new PDO('mysql:host=sql14.jnb1.host-h.net;dbname=DB_Name', "silkgeqafj_4", "Password");
  $con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $query = 
  "SELECT vehicle_plate as 'Plate',
  vehicle_color as 'Color',
  vehicle_model as 'Model',
  vehicle_ownername as 'Owner Name',
  vehicle_impoundedTill as 'Release Date'
  FROM vehicles where vehicle_isImpounded = true ";

if (!empty($query){

  //first pass just gets the column names
  print "<table> ";
  $result = $con->query($query);
  //return only the first row (we only need field names)
  $row = $result->fetch(PDO::FETCH_ASSOC);
        print " <tr> ";
        foreach ($row as $field => $value){
        print " <th>$field</th> ";
        } // end foreach
            print " </tr> ";
            //second query gets the data
            $data = $con->query($query);
            $data->setFetchMode(PDO::FETCH_ASSOC);
            foreach($data as $row){
                print " <tr> ";
                    foreach ($row as $name=>$value){
                    print " <td>$value</td> ";
                    } // end field loop
            print " </tr> ";
            } // end record loop
            print "</table> ";

  elseif (empty($query){
      echo 'There are no cars impounded'
  }
  }  
  } 
  catch(PDOException $e) {
   echo 'ERROR: ' . $e->getMessage();
  } // end try
 ?>